Issued Patents All Time
Showing 51–66 of 66 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6516878 | Downhole tension swivel sub | Lawrence Barr | 2003-02-11 |
| 6484802 | Downhole scraper assembly | Ian Gillies | 2002-11-26 |
| 6431273 | Inflatable packer | Ian Gillies | 2002-08-13 |
| 6330919 | Method of removing wellhead assemblies and cutting assembly for use therein | — | 2001-12-18 |
| 6293342 | Bypass valve closing means | Rory McCrae Tulloch | 2001-09-25 |
| 6279962 | Safety joint | Valentine H. McGarian | 2001-08-28 |
| 6173795 | Multi-cycle circulating sub | Lawrence Barr | 2001-01-16 |
| 6123150 | Branch boreholes | Ronald James Bruce | 2000-09-26 |
| 6095249 | Down hole bypass valve | Rory McCrae Tulloch, Lawrence Barr | 2000-08-01 |
| 6050334 | Single trip whipstock assembly | Manfred Steinkamp | 2000-04-18 |
| 6024166 | Apparatus for forming a slot in a wellbore | Rory McCrae Tulloch | 2000-02-15 |
| 5911275 | Apparatus for milling a well casing | Werner Lau, Rory McCrae Tulloch | 1999-06-15 |
| 5853054 | 2-Stage underreamer | Richard A. Armell | 1998-12-29 |
| 5778995 | Milling insert and a milling tool | — | 1998-07-14 |
| 5531280 | Drill string anchor | Manfred Steinkamp, Werner Lau | 1996-07-02 |
| 5261498 | Drill string component | Manfred Steinkamp, Werner Lau | 1993-11-16 |